CONTROL METHOD OF SPEED OF POSITIVE-DISPLACEMENT HYDRAULIC DRIVE WITH COMBINED FREQUENCY-THROTTLE CONTROL SYSTEM AT START-UP UNDER LOAD Russian patent published in 2014 - IPC F15B9/09 

FIELD: machine building.

SUBSTANCE: method provides for installation at preparation for start-up of a positive-displacement hydraulic drive under load of minimum hydraulic resistance of a proportional hydraulic unit with its further increase as per a sequence from a controller after completion of an idle stroke till the specified speed and frequency of supply voltage of a pump electric motor is achieved, at which supply of a non-adjustable pump provides the speed that is higher than the speed specified at fully closed proportional hydraulic unit with further automatic correction from the controller depending on external loads; then, start-up of the hydraulic drive at idle stroke and further conversion from idle stroke to the operating mode is performed.

EFFECT: improving reliability parameters; reducing the scope of maintenance and repair work; improving environmental measures due to reducing intensity of failures of movable and fixed seals.

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